/usr/share/doc/root/test/eventb.cxx is in root-system-doc 5.34.30-0ubuntu8.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | // @(#)root/test:$Id$
// Author: Rene Brun 10/01/97
{
// This macro is a variant of the macro eventa.
//
// NOTE: Before executing this macro, you must have executed the macro eventload.
//
// This small program loop on all events:
// - It reads the small branch containing the number of tracks per event
// - It reads the full event only for events having less than 587 tracks
// - It dumps the selected events.
gROOT->Reset();
// Connect file generated in $ROOTSYS/test
TFile f("Event.root");
// Read Tree named "T" in memory. Tree pointer is assigned the same name
TTree *T = (TTree*)f.Get("T");
// Create a timer object to benchmark this loop
TStopwatch timer;
timer.Start();
// Start main loop on all events
Event *event = new Event(); //we create the event object once outside the loop
TBranch *bntrack = T->GetBranch("fNtrack");
TBranch *branch = T->GetBranch("event");
branch->SetAddress(&event);
Int_t nevent = T->GetEntries();
Int_t nselected = 0;
Int_t nb = 0;
for (Int_t i=0;i<nevent;i++) {
if(i%50 == 0) printf("Event:%d\n",i);
bntrack->GetEntry(i); //read branch "fNtrack" only
if (event->GetNtrack() > 587)continue; //reject events with more than 587 tracks
nb += T->GetEntry(i); //read complete accepted event in memory
nselected++;
if (nselected == 1) event->Dump(); //dump the first accepted event
event->Clear(); //clear tracks array
}
// Stop timer and print results
timer.Stop();
Float_t mbytes = T->GetTotBytes()*1.e-6;
Double_t rtime = timer.RealTime();
Double_t ctime = timer.CpuTime();
printf("You have selected %d events out of %d\n",nselected,nevent);
printf("RealTime=%f seconds, CpuTime=%f seconds\n",rtime,ctime);
printf("You have scanned %f Mbytes/Realtime seconds\n",mbytes/rtime);
printf("You have scanned %f Mbytes/Cputime seconds\n",mbytes/ctime);
f.Close();
}
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